Tach Help

Jack Frost · Post by **Jack Frost** » Mon Jan 22, 2007 11:56 pm

I have a 1978 cyclone 340 that I am restoring and just about done. The problem is that the tach sits at 5500 rpm with the sled running and goes up from there when you give it some throttle. This is a 8000 rpm tach with no deere logo on it. To further complicate things this is the second tach I have tried and they both do the same thing. Now to really mess things up I tried a 10000 rpm tach with the deere logo and a fuse and it works fine except it's the wrong one for 1978. Any help would be appreciated

sledhunter · Post by **sledhunter** » Tue Jan 23, 2007 9:16 am

well im not gonna pretend to know much about sled but in my opinion i would just go with what works for now and keep looking for hte right one better to have a incorrect tach that works then one thats completely off its rocker

Jack Frost · Post by **Jack Frost** » Tue Jan 23, 2007 6:52 pm

Went through the whole wire harness today and every thing is hooked up properly but still have the same problem with the tach sitting at 5500 rpm. I even tried another tach to bring the total to four and still no luck. please help.

Dave

:blink:

Mr. Deere · Post by **Mr. Deere** » Tue Jan 23, 2007 6:57 pm

is it when the sleds off or on they run high. my Liquifire should be ideling at about 3000 with my clutch engageing around 5000-6000 So it might be normal. what is the Deere one say when its at idel. and clutch engagement and what does the other one say at clutch engagement and how far up do the other ones go to 10000 also. BOB

harleysportster · Post by **harleysportster** » Tue Jan 23, 2007 7:05 pm

The 10,000 RPM tach is the correct one for 1978. JD part # AM53193, the same tach use on the 76-78 liquifires.

Jack Frost · Post by **Jack Frost** » Tue Jan 23, 2007 7:16 pm

The speedo is origional and it doesn't have the deere logo. The sled did not have a tach when I purchased it but I put one on. So the 78 cyclone should have a 10000 rpm tach with no deere logo?

Dave.

:blink:

Mr. Deere · Post by **Mr. Deere** » Tue Jan 23, 2007 7:25 pm

If it is the part number he posted then your good. BOB

harleysportster · Post by **harleysportster** » Tue Jan 23, 2007 8:03 pm

The 76-78 cylone did not have a tach from the factory. The tach was a dealer /owner installed option. JD part # AM53193 tach does not have the deere logo.

Jack Frost · Post by **Jack Frost** » Wed Jan 24, 2007 1:36 am

Just spent the last 4 hours changing 22 track cleats on my original 78 cyclone with no tach.

Gotta pray for some more snow before I can get her out for the first ride of the year. Thanks for the info Harleysportster will put it to good use.

Regards: Dave

:blink:

Rodimus Prime · Post by **Rodimus Prime** » Wed Jan 24, 2007 4:47 am

well this is gone on long enough...

1) a bad voltage regulator will throw off a tach badly..

2) jd and skidoo used simular tachs minus logo

3) most tachs have an adjustment hole at back for either 4,6,8 cylinders and/or an adjustment screw.

Jack Frost · Post by **Jack Frost** » Thu Jan 25, 2007 11:54 pm

Cecked regulator it was ok. Just going to use the one that works till I find the right tach. Thanks for the help guys.

Dave.

harleysportster · Post by **harleysportster** » Fri Jan 26, 2007 12:23 am

shoot a picture of your tach that works...

Jack Frost · Post by **Jack Frost** » Fri Jan 26, 2007 12:32 am

Have pictures of the whole dash just don't know how to upload them yet. Sent Matt a email just waiting for his reply.

Dave.

harleysportster · Post by **harleysportster** » Fri Jan 26, 2007 2:35 pm

Sent them to me, I'll post them . When you post a response, click on the "more options" button. Scroll the page down and you will see a "browse" button. Click on that and locate the pictures on your computer and then open them up. It will load them in the post when you" Add Reply"